Rheological behavior of PAA–C
n
TAB complex: influence of PAA charge density and surfactant tail length in PAA semidilute aqueous solution |
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Authors: | Qiang Wu Miao Du Tao Ye Yong-gang Shangguan Jian-ping Zhou Qiang Zheng |
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Institution: | (1) Department of Polymer Science and Engineering, Key Laboratory of Macromolecular Synthesis and Functionalization, Ministry of Education, Zhejiang University, 38 Zheda Road, Yuquan Campus, Hangzhou, 310027, People’s Republic of China |
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Abstract: | Interactions between anionic polyelectrolyte, poly(acrylic acid) (PAA), and cationic surfactant, alkyltrimethylammonium bromide
(C
n
TAB), were investigated by rheological measurements in semidilute PAA solution. The dependences of the rheological behavior
on the chain length of the surfactant, PAA neutralization degree, and temperature were discussed. The results revealed that
both dodecyl and cetyltrimethylammonium bromides (C12TAB and C16TAB) could increase the viscosity of PAA solution when the surfactant amounts surpassed a critical surfactant concentration
(C
c), and C
c of C16TAB was lower than that of C12TAB at same PAA neutralization degree. The increase of viscosity is attributed to the surfactant micelles bridging of the
polymer chains and confine the mobility PAA chain. On the other hand, it is found that the hydrogen bonding also played an
important role in the PAA–C
n
TAB system, especially in lower neutralization degree PAA solution, which results in the viscosity increase rapidly with the
added surfactant into lower neutralization degree PAA solution. |
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Keywords: | Polyelectrolyte Surfactant Micelle Viscosity Hydrogen bonding |
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